light flywheel on my engine?
Turbo Mini Forums

hi, can anyone advise if an ultralight flywheel would be benificial to my build?

engine is 1275 non mg metro block and pistons, sw5 cam, mk3 cooper s head (not sure if i should port and polish this when i rebuild it?), t3, sccr gearbox, sc drops, 4 pin diff, ap uprated clutch. will be running 6-7 psi.

would an ultralight flywheel be any good to such a build? also, what diaphram should i get?i have seen several uprated ones going by colour.

is it also worth getting hardened unleaded valve seats put in the head when i strip it?

if built properly, can i expect over 100 bhp and a nice bit of torque from this engine? thanks

also going to run rs turbo intercooler, and a 13 row oil cooler.ta

Yes, get the ultralight, and go for a grey spring, bit overkill for 6/7 psi, but you will not stay that low in future.

cheers.how about the head?would it be worthwhile having the unleaded seats put in and porting and polishing it?thanks

the head makes a BIG! diffrence with race valves etc......... unleaded stops you from adding lead replacement additives thats all

using the ultralight flywheel will make the engine spin up very quickley

yes as T2 clubby states use a grey cover and use an AP race plate

100 bhp is very easy from this spec ....lets say 10 psi of boost with intercooler will translate into somewhere around 135..ish bhp

obviously the pistons and head are standard spec, so putting it together as it is. build is costing a fortune so will uprate pistons/head in future.

not sure that the components stated will survive 10psi, even with the intercooler.

where is the best quality for price ulralight flywheel abvalable from?cheers

minispares north get flwheel and back plate and AP race plate

seen a few on ebay.any good or stay clear?

dont know ?

if you get a lighten set up you will have to have the whole assembley ballanced up

Hi,
10 psi properly setup on a good condition engine shouldn't be a problem.
Cheers,
Gavin :)

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My Mini build diary

seen a few on ebay.any good or stay clear?

so with an ultralight flywheel i will defineately feel a difference in response and performance?

Hi Dan,

I have an 1132 with lightened and balanced everything. You do notice the difference when its lightened, revs feel quicker and it gets moving quicker too... only downside for me is because its lighter, I tend to take off and not rev it enough so it kind of bogs down... but having said that, its partly my driving.

If you are doing it, I would do the head... no point otherwise (no offense to anyone) In a mini (doesnt matter which type of A series) the head is the biggest restriction. Get the head sorted first.

As for pistons, Ben and I are running Hypatecs with Hastings rings and they are holding fast at 140bhp (or bananas)
Thats running 10psi... Ben is running slightly more now)

I had my flywheel lightened and balanced... didnt replace it with an actual lightened flywheel off the shelf.

Peter.

1132cc Turbo ~120 bananas ATW - Fun Fun Fun

i will be porting and polishing the head. if you lighten the flywheel dand have them ballenecd together?

also, i will be drilling and tapping the block for 11 studs. does anyone know the depth i need to go on an a+ engine for the 2 extra studs before waterways/oil ways etc are hit?ta

sorry, lost a bit of the last post. - if you ligen the flywheel do you have to remove the crank and have them balenced together?

Balancing the lot is the best way to go... take them all in and balance

Pete

1132cc Turbo ~120 bananas ATW - Fun Fun Fun

Pete (pristic), slightly off topic, but I see you are using the Hypatec pistons...
Are they the ones from Minisport(Australia) ?
Reason for asking is I have a set (the 73mm ones to give 1360 from a 1275 block) and they don't have much volume in their dish (about 7.3cc) so I'm going to machine some more out and am wondering how far I dare go!
Rod.

Schrödinger's cat - so which one am I ???

10psi on standard components is fine with an intercooler.

Mine has the basic low compression head from Benross and had 15psi with no problem, other than the gearbox lol! The transmission is the weak link.

In the 13's at last!.. Just

i have a sccr gearbox with sc drops, and 4 pin diff.all tran x.ta

dan, 11 stud drilling dan 12.5 mm water pump side into the block and no! more.

the flywheel side the depth of the other head studs in the block

you will have to have the whole rotating assembley balanced crank, damper, clutch, the whole rotating assembley

retired
theres mega meat on those piston crowns you will get some good cc in there

the engine is standard cr. im not worried about the quality of the standard parts, but what they can withstand at standard cr.
also, i have forged rockers bushed to 1.4. are these any good for my build or should i use standard a+ ones?ta

benross, do you mean the crowns are thick for machining deeper dish for more cr? how about other a+ pistons? i have an allegro engine, and a few 1275 mayfair ones.

use the standard ones on your spec if you are on a budget rockers

its the detonation which will quickly kill the pistons if you wind the engine up on the standard CR you want 28cc in the chambers on the head this will then bring the cr town to a sane level 8.4:1
will be good for 10 psi no intercooler or..... 12 + with

for get the allegro pistons etc ... these wont survive any boost and wont last 10 mins

the standard turbo pistons are well up to the job i have run these at 16 psi of boost with no problems ..... of course the engine was set up and i lowerd the CR by modding the head chambers

the comment i made was the hypetec pistons from Australia
you cant just machine any old piston

You! Need the cr lowering in the head i can provide this service if you wish
please pm me

Hope this helps!

Edited by BENROSS on 3rd Apr, 2008.

as i said im not looking for a moded head at the moment. i realise this is the way to go but cannot justify spending any more money at the moment. i will be happy with 100bhp, maybe a little more from my 1st turbo engine.

i have bot standard a+ rockers, as well as a series ones bushed to 1.4.

what would be more suitable for the engine planned at the top of the page?ta

yes the bushes will work ok with the SW5 cam, but...... in genrall!!! i would not bother in a force induction engine its not worth the effot ... some may disagree

if you have the old pressed steel rockers from the "A" series use them they are 1.3 ratio more suited and you just bolt them on